From the Path of the Heart pattern I've seen, your purl rows should be all purl, rather than a reversal of the knit rows. Well, all purl except for the 4 border sts which would be knit (forgot this part!). From what I see of what you've written above, however, your reversal seems to match stitchwise, so I'm not sure where you're having a problem.

I would probably, for a few rows, count off the stitches as I go, plus count at the end of the row again to be sure. If that didn't help, I would stop and put markers after every 10 sts, and then count those as I went...just to see exactly where the problem is,

__________________Wenda"Be afraid of bears, of bungee-jumping, of faulty wiring in old houses, but never, ever be afraid of trying something in knitting."Stephanie Pearl-McPhee, Knitting Rules